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Contains:  IC 3582, NGC 4565, NGC 4562
Getting plate-solving status, please wait...
NGC 4565, 





    
        

            Daniel.P
NGC 4565

NGC 4565

Technical card

Resolution: 3040x2024

Dates:April 17, 2017April 18, 2017

Frames:
13x600" -15C bin 1x1
11x900" -15C bin 1x1

Integration: 4.9 hours

Flats: ~5

Bias: ~20

Avg. Moon age: 20.86 days

Avg. Moon phase: 63.52%

Mean SQM: 21.40

Mean FWHM: 3.00

Astrometry.net job: 1561460

RA center: 189.077 degrees

DEC center: 26.001 degrees

Pixel scale: 0.700 arcsec/pixel

Orientation: 103.286 degrees

Field radius: 0.355 degrees

Locations: Duc, Prayssas, Lot et Garonne, France

Description

Spring session under dark sky before moon rise : SQM 21.4 at zenith.
Unable start AO (mounted) probably one motor stuck in limit position. Will need to unjam it.

I have also combined data from 2014 data from May 2017.
The result is displayed in version Original & Final resulting in nearly 11 hours of exposure.
The B version is picture from 2017 data only.
Both have been processed the same way.
Version C is an animated version of A and B.

I have tried to scale both images so the noise is similar.
It can be noted the "combined" version have more signal/noise, but that it is less sharp as it suffer from less round stars and also the shorter focal length (F/D=7) from 2014 data.

Pre-processing done in Pixinsight :
- overscan area offset correction
- bias correction
- hot pixel correction
- debayer
- registration
- stack
Processing done in Pixinsight :
- backgroung color neutralisation
- color calibration using galaxy
- sky background removal (DBE in PI)
- slight deconvolution (masked)
- non linear image creation
- color saturation boost masked
- green neutral
- TGV denoise
- slight HDR
Final image :
- jpeg calibration done in Mac Photo (levels adjust and further saturation boost and color balance)

Comments

Author

Daniel.P
Daniel.P
License: None (All rights reserved)
1691
Like

Revisions

  • NGC 4565, 





    
        

            Daniel.P
    Original
  • NGC 4565, 





    
        

            Daniel.P
    B
  • Final
    NGC 4565, 





    
        

            Daniel.P
    C

B

B version is with May 2017 data only

C

Animation

Sky plot

Sky plot

Histogram

NGC 4565, 





    
        

            Daniel.P